 In their research, they used a border definition of the area, which their Port Shelter includes Port Shelter proper, Inner and Outer Port Shelter as well as Hebe Haven, and is a bay that "bordered on its northernside by the Sai Kung Peninsula and on its west and southwestern sides by the Clear Water Bay Peninsula".They also found out that, some data point of their research, are obviously influenced by surface runoff and pollution loading from the surrounding catchment area.These islands are considered within the boundary of the water body of the Port Shelter proper